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Journal article

Controlled indole-3-acetaldoxime production through ethanol-induced expression of CYP79B2

In Planta — 2009, Volume 229, Issue 6, pp. 1209-1217

By Mikkelsen, M.D.; Fuller, V.L.; Hansen, Bjarne Gram1,2; Nafisi, M.; Olsen, C.E.; Nielsen, Henrik Bjørn2,3; Halkier, B.A.

From

Center for Microbial Biotechnology, Department of Systems Biology, Technical University of Denmark1

Department of Systems Biology, Technical University of Denmark2

Center for Biological Sequence Analysis, Department of Systems Biology, Technical University of Denmark3

Indole-3-acetaldoxime (IAOx) is a key branching point between primary and secondary metabolism. IAOx serves as an intermediate in the biosynthesis of indole glucosinolates (I-GLSs), camalexin and the plant hormone indole-3-acetic acid (IAA). The cytochrome P450s CYP79B2 and CYP79B3 catalyze the conversion of tryptophan to IAOx.

CYP83B1 channels IAOx into I-GLS biosynthesis, CYP71A13 channels IAOx into camalexin biosynthesis, whereas the IAOx-metabolizing enzyme in IAA biosynthesis is not known. In this report, we demonstrate controlled production of I-GLSs by introducing an ethanol (EtOH)-inducible CYP79B2 construct into double (cyp79b2 cyp79b3) or triple (cyp79b2 cyp79b3 cyp83b1) mutant lines.

We show EtOH-dependent induction of camalexin and identify a number of candidate IAA homeostasis- or defense-related genes by clustered microarray analysis. The transgenic mutant lines are thus promising tools for elucidating the interplay between primary and secondary metabolism.

Language: English
Publisher: Springer-Verlag
Year: 2009
Pages: 1209-1217
Journal subtitle: An International Journal of Plant Biology
ISSN: 14322048 and 00320935
Types: Journal article
DOI: 10.1007/s00425-009-0907-5
ORCIDs: Nielsen, Henrik Bjørn , 0000-0002-2275-0596 and 0000-0002-3742-702X
Keywords

CYP79B2 CYP79B3 Camalexin Ethanol-inducible Glucosinolates Indole-3-acetaldoxime Secondary metabolism

Other keywords

Agriculture Arabidopsis Arabidopsis Proteins Biosynthetic Pathways CYP83B1 protein, Arabidopsis Chromatography, Liquid Cluster Analysis Cytochrome P-450 Enzyme System Ecology Ethanol Forestry Gene Expression Profiling Gene Expression Regulation, Enzymologic Gene Expression Regulation, Plant Indoleacetic Acids Indoles Life Sciences Mass Spectrometry Molecular Structure Mutation Oligonucleotide Array Sequence Analysis Oximes Plant Sciences Plants, Genetically Modified Thiazoles camalexin cytochrome P-450 79B2 protein, Arabidopsis cytochrome P-450 CYP79B3, Sinapis alba indole-3-acetaldoxime indoleacetic acid

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